Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * File...........: linux/drivers/s390/block/dasd_ioctl.c | |
3 | * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com> | |
4 | * Horst Hummel <Horst.Hummel@de.ibm.com> | |
5 | * Carsten Otte <Cotte@de.ibm.com> | |
6 | * Martin Schwidefsky <schwidefsky@de.ibm.com> | |
7 | * Bugreports.to..: <Linux390@de.ibm.com> | |
8 | * (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 1999-2001 | |
9 | * | |
10 | * i/o controls for the dasd driver. | |
11 | */ | |
fc19f381 SH |
12 | |
13 | #define KMSG_COMPONENT "dasd" | |
14 | ||
1da177e4 LT |
15 | #include <linux/interrupt.h> |
16 | #include <linux/major.h> | |
17 | #include <linux/fs.h> | |
18 | #include <linux/blkpg.h> | |
405f5571 | 19 | #include <linux/smp_lock.h> |
1da177e4 LT |
20 | |
21 | #include <asm/ccwdev.h> | |
8b2eb664 | 22 | #include <asm/cmb.h> |
1da177e4 LT |
23 | #include <asm/uaccess.h> |
24 | ||
25 | /* This is ugly... */ | |
26 | #define PRINTK_HEADER "dasd_ioctl:" | |
27 | ||
28 | #include "dasd_int.h" | |
29 | ||
1da177e4 | 30 | |
1da177e4 | 31 | static int |
13c6204f | 32 | dasd_ioctl_api_version(void __user *argp) |
1da177e4 LT |
33 | { |
34 | int ver = DASD_API_VERSION; | |
b5029622 | 35 | return put_user(ver, (int __user *)argp); |
1da177e4 LT |
36 | } |
37 | ||
38 | /* | |
39 | * Enable device. | |
40 | * used by dasdfmt after BIODASDDISABLE to retrigger blocksize detection | |
41 | */ | |
42 | static int | |
13c6204f | 43 | dasd_ioctl_enable(struct block_device *bdev) |
1da177e4 | 44 | { |
8e09f215 | 45 | struct dasd_block *block = bdev->bd_disk->private_data; |
1da177e4 LT |
46 | |
47 | if (!capable(CAP_SYS_ADMIN)) | |
48 | return -EACCES; | |
13c6204f | 49 | |
8e09f215 | 50 | dasd_enable_device(block->base); |
1da177e4 | 51 | /* Formatting the dasd device can change the capacity. */ |
c039e313 | 52 | mutex_lock(&bdev->bd_mutex); |
8e09f215 | 53 | i_size_write(bdev->bd_inode, (loff_t)get_capacity(block->gdp) << 9); |
c039e313 | 54 | mutex_unlock(&bdev->bd_mutex); |
1da177e4 LT |
55 | return 0; |
56 | } | |
57 | ||
58 | /* | |
59 | * Disable device. | |
60 | * Used by dasdfmt. Disable I/O operations but allow ioctls. | |
61 | */ | |
62 | static int | |
13c6204f | 63 | dasd_ioctl_disable(struct block_device *bdev) |
1da177e4 | 64 | { |
8e09f215 | 65 | struct dasd_block *block = bdev->bd_disk->private_data; |
1da177e4 LT |
66 | |
67 | if (!capable(CAP_SYS_ADMIN)) | |
68 | return -EACCES; | |
13c6204f | 69 | |
1da177e4 LT |
70 | /* |
71 | * Man this is sick. We don't do a real disable but only downgrade | |
72 | * the device to DASD_STATE_BASIC. The reason is that dasdfmt uses | |
73 | * BIODASDDISABLE to disable accesses to the device via the block | |
74 | * device layer but it still wants to do i/o on the device by | |
75 | * using the BIODASDFMT ioctl. Therefore the correct state for the | |
76 | * device is DASD_STATE_BASIC that allows to do basic i/o. | |
77 | */ | |
8e09f215 | 78 | dasd_set_target_state(block->base, DASD_STATE_BASIC); |
1da177e4 LT |
79 | /* |
80 | * Set i_size to zero, since read, write, etc. check against this | |
81 | * value. | |
82 | */ | |
c039e313 | 83 | mutex_lock(&bdev->bd_mutex); |
1da177e4 | 84 | i_size_write(bdev->bd_inode, 0); |
c039e313 | 85 | mutex_unlock(&bdev->bd_mutex); |
1da177e4 LT |
86 | return 0; |
87 | } | |
88 | ||
89 | /* | |
90 | * Quiesce device. | |
91 | */ | |
8e09f215 | 92 | static int dasd_ioctl_quiesce(struct dasd_block *block) |
1da177e4 | 93 | { |
1da177e4 | 94 | unsigned long flags; |
8e09f215 | 95 | struct dasd_device *base; |
138c014d | 96 | |
8e09f215 | 97 | base = block->base; |
1da177e4 LT |
98 | if (!capable (CAP_SYS_ADMIN)) |
99 | return -EACCES; | |
138c014d | 100 | |
ca99dab0 SH |
101 | pr_info("%s: The DASD has been put in the quiesce " |
102 | "state\n", dev_name(&base->cdev->dev)); | |
8e09f215 | 103 | spin_lock_irqsave(get_ccwdev_lock(base->cdev), flags); |
eb6e199b | 104 | dasd_device_set_stop_bits(base, DASD_STOPPED_QUIESCE); |
8e09f215 | 105 | spin_unlock_irqrestore(get_ccwdev_lock(base->cdev), flags); |
1da177e4 LT |
106 | return 0; |
107 | } | |
108 | ||
109 | ||
110 | /* | |
fc19f381 | 111 | * Resume device. |
1da177e4 | 112 | */ |
8e09f215 | 113 | static int dasd_ioctl_resume(struct dasd_block *block) |
1da177e4 | 114 | { |
1da177e4 | 115 | unsigned long flags; |
8e09f215 | 116 | struct dasd_device *base; |
138c014d | 117 | |
8e09f215 | 118 | base = block->base; |
138c014d | 119 | if (!capable (CAP_SYS_ADMIN)) |
1da177e4 LT |
120 | return -EACCES; |
121 | ||
ca99dab0 SH |
122 | pr_info("%s: I/O operations have been resumed " |
123 | "on the DASD\n", dev_name(&base->cdev->dev)); | |
8e09f215 | 124 | spin_lock_irqsave(get_ccwdev_lock(base->cdev), flags); |
eb6e199b | 125 | dasd_device_remove_stop_bits(base, DASD_STOPPED_QUIESCE); |
8e09f215 | 126 | spin_unlock_irqrestore(get_ccwdev_lock(base->cdev), flags); |
1da177e4 | 127 | |
8e09f215 | 128 | dasd_schedule_block_bh(block); |
1da177e4 LT |
129 | return 0; |
130 | } | |
131 | ||
132 | /* | |
133 | * performs formatting of _device_ according to _fdata_ | |
134 | * Note: The discipline's format_function is assumed to deliver formatting | |
135 | * commands to format a single unit of the device. In terms of the ECKD | |
136 | * devices this means CCWs are generated to format a single track. | |
137 | */ | |
8e09f215 | 138 | static int dasd_format(struct dasd_block *block, struct format_data_t *fdata) |
1da177e4 LT |
139 | { |
140 | struct dasd_ccw_req *cqr; | |
8e09f215 | 141 | struct dasd_device *base; |
1da177e4 LT |
142 | int rc; |
143 | ||
8e09f215 SW |
144 | base = block->base; |
145 | if (base->discipline->format_device == NULL) | |
1da177e4 LT |
146 | return -EPERM; |
147 | ||
8e09f215 | 148 | if (base->state != DASD_STATE_BASIC) { |
ca99dab0 SH |
149 | pr_warning("%s: The DASD cannot be formatted while it is " |
150 | "enabled\n", dev_name(&base->cdev->dev)); | |
1da177e4 LT |
151 | return -EBUSY; |
152 | } | |
153 | ||
8e09f215 | 154 | DBF_DEV_EVENT(DBF_NOTICE, base, |
b44b0ab3 | 155 | "formatting units %u to %u (%u B blocks) flags %u", |
1da177e4 LT |
156 | fdata->start_unit, |
157 | fdata->stop_unit, fdata->blksize, fdata->intensity); | |
158 | ||
159 | /* Since dasdfmt keeps the device open after it was disabled, | |
160 | * there still exists an inode for this device. | |
161 | * We must update i_blkbits, otherwise we might get errors when | |
162 | * enabling the device later. | |
163 | */ | |
164 | if (fdata->start_unit == 0) { | |
8e09f215 | 165 | struct block_device *bdev = bdget_disk(block->gdp, 0); |
1da177e4 LT |
166 | bdev->bd_inode->i_blkbits = blksize_bits(fdata->blksize); |
167 | bdput(bdev); | |
168 | } | |
169 | ||
170 | while (fdata->start_unit <= fdata->stop_unit) { | |
8e09f215 | 171 | cqr = base->discipline->format_device(base, fdata); |
1da177e4 LT |
172 | if (IS_ERR(cqr)) |
173 | return PTR_ERR(cqr); | |
174 | rc = dasd_sleep_on_interruptible(cqr); | |
8e09f215 | 175 | dasd_sfree_request(cqr, cqr->memdev); |
1da177e4 LT |
176 | if (rc) { |
177 | if (rc != -ERESTARTSYS) | |
ca99dab0 SH |
178 | pr_err("%s: Formatting unit %d failed with " |
179 | "rc=%d\n", dev_name(&base->cdev->dev), | |
180 | fdata->start_unit, rc); | |
1da177e4 LT |
181 | return rc; |
182 | } | |
183 | fdata->start_unit++; | |
184 | } | |
185 | return 0; | |
186 | } | |
187 | ||
188 | /* | |
189 | * Format device. | |
190 | */ | |
191 | static int | |
13c6204f | 192 | dasd_ioctl_format(struct block_device *bdev, void __user *argp) |
1da177e4 | 193 | { |
8e09f215 | 194 | struct dasd_block *block = bdev->bd_disk->private_data; |
1da177e4 LT |
195 | struct format_data_t fdata; |
196 | ||
197 | if (!capable(CAP_SYS_ADMIN)) | |
198 | return -EACCES; | |
13c6204f | 199 | if (!argp) |
1da177e4 | 200 | return -EINVAL; |
f24acd45 | 201 | |
8e09f215 | 202 | if (block->base->features & DASD_FEATURE_READONLY) |
1da177e4 | 203 | return -EROFS; |
13c6204f | 204 | if (copy_from_user(&fdata, argp, sizeof(struct format_data_t))) |
1da177e4 LT |
205 | return -EFAULT; |
206 | if (bdev != bdev->bd_contains) { | |
ca99dab0 SH |
207 | pr_warning("%s: The specified DASD is a partition and cannot " |
208 | "be formatted\n", | |
209 | dev_name(&block->base->cdev->dev)); | |
1da177e4 LT |
210 | return -EINVAL; |
211 | } | |
8e09f215 | 212 | return dasd_format(block, &fdata); |
1da177e4 LT |
213 | } |
214 | ||
215 | #ifdef CONFIG_DASD_PROFILE | |
216 | /* | |
217 | * Reset device profile information | |
218 | */ | |
8e09f215 | 219 | static int dasd_ioctl_reset_profile(struct dasd_block *block) |
1da177e4 | 220 | { |
8e09f215 | 221 | memset(&block->profile, 0, sizeof(struct dasd_profile_info_t)); |
1da177e4 LT |
222 | return 0; |
223 | } | |
224 | ||
225 | /* | |
226 | * Return device profile information | |
227 | */ | |
8e09f215 | 228 | static int dasd_ioctl_read_profile(struct dasd_block *block, void __user *argp) |
1da177e4 | 229 | { |
9a7af289 HH |
230 | if (dasd_profile_level == DASD_PROFILE_OFF) |
231 | return -EIO; | |
8e09f215 SW |
232 | if (copy_to_user(argp, &block->profile, |
233 | sizeof(struct dasd_profile_info_t))) | |
1da177e4 LT |
234 | return -EFAULT; |
235 | return 0; | |
236 | } | |
237 | #else | |
8e09f215 | 238 | static int dasd_ioctl_reset_profile(struct dasd_block *block) |
1da177e4 LT |
239 | { |
240 | return -ENOSYS; | |
241 | } | |
242 | ||
8e09f215 | 243 | static int dasd_ioctl_read_profile(struct dasd_block *block, void __user *argp) |
1da177e4 LT |
244 | { |
245 | return -ENOSYS; | |
246 | } | |
247 | #endif | |
248 | ||
249 | /* | |
250 | * Return dasd information. Used for BIODASDINFO and BIODASDINFO2. | |
251 | */ | |
8e09f215 SW |
252 | static int dasd_ioctl_information(struct dasd_block *block, |
253 | unsigned int cmd, void __user *argp) | |
1da177e4 | 254 | { |
1da177e4 LT |
255 | struct dasd_information2_t *dasd_info; |
256 | unsigned long flags; | |
c6eb7b77 | 257 | int rc; |
8e09f215 | 258 | struct dasd_device *base; |
1da177e4 | 259 | struct ccw_device *cdev; |
9a92fe48 | 260 | struct ccw_dev_id dev_id; |
1da177e4 | 261 | |
8e09f215 SW |
262 | base = block->base; |
263 | if (!base->discipline->fill_info) | |
1da177e4 LT |
264 | return -EINVAL; |
265 | ||
554a826e | 266 | dasd_info = kzalloc(sizeof(struct dasd_information2_t), GFP_KERNEL); |
1da177e4 LT |
267 | if (dasd_info == NULL) |
268 | return -ENOMEM; | |
269 | ||
8e09f215 | 270 | rc = base->discipline->fill_info(base, dasd_info); |
1da177e4 LT |
271 | if (rc) { |
272 | kfree(dasd_info); | |
273 | return rc; | |
274 | } | |
275 | ||
8e09f215 | 276 | cdev = base->cdev; |
9a92fe48 | 277 | ccw_device_get_id(cdev, &dev_id); |
1da177e4 | 278 | |
9a92fe48 | 279 | dasd_info->devno = dev_id.devno; |
8e09f215 | 280 | dasd_info->schid = _ccw_device_get_subchannel_number(base->cdev); |
1da177e4 LT |
281 | dasd_info->cu_type = cdev->id.cu_type; |
282 | dasd_info->cu_model = cdev->id.cu_model; | |
283 | dasd_info->dev_type = cdev->id.dev_type; | |
284 | dasd_info->dev_model = cdev->id.dev_model; | |
8e09f215 | 285 | dasd_info->status = base->state; |
57467195 HH |
286 | /* |
287 | * The open_count is increased for every opener, that includes | |
288 | * the blkdev_get in dasd_scan_partitions. | |
289 | * This must be hidden from user-space. | |
290 | */ | |
8e09f215 SW |
291 | dasd_info->open_count = atomic_read(&block->open_count); |
292 | if (!block->bdev) | |
57467195 | 293 | dasd_info->open_count++; |
138c014d | 294 | |
1da177e4 LT |
295 | /* |
296 | * check if device is really formatted | |
297 | * LDL / CDL was returned by 'fill_info' | |
298 | */ | |
8e09f215 SW |
299 | if ((base->state < DASD_STATE_READY) || |
300 | (dasd_check_blocksize(block->bp_block))) | |
1da177e4 | 301 | dasd_info->format = DASD_FORMAT_NONE; |
f24acd45 | 302 | |
c6eb7b77 | 303 | dasd_info->features |= |
8e09f215 | 304 | ((base->features & DASD_FEATURE_READONLY) != 0); |
1da177e4 | 305 | |
8e09f215 SW |
306 | if (base->discipline) |
307 | memcpy(dasd_info->type, base->discipline->name, 4); | |
1da177e4 LT |
308 | else |
309 | memcpy(dasd_info->type, "none", 4); | |
554a826e | 310 | |
8e09f215 | 311 | if (block->request_queue->request_fn) { |
1da177e4 LT |
312 | struct list_head *l; |
313 | #ifdef DASD_EXTENDED_PROFILING | |
314 | { | |
315 | struct list_head *l; | |
8e09f215 SW |
316 | spin_lock_irqsave(&block->lock, flags); |
317 | list_for_each(l, &block->request_queue->queue_head) | |
1da177e4 | 318 | dasd_info->req_queue_len++; |
8e09f215 | 319 | spin_unlock_irqrestore(&block->lock, flags); |
1da177e4 LT |
320 | } |
321 | #endif /* DASD_EXTENDED_PROFILING */ | |
8e09f215 SW |
322 | spin_lock_irqsave(get_ccwdev_lock(base->cdev), flags); |
323 | list_for_each(l, &base->ccw_queue) | |
1da177e4 | 324 | dasd_info->chanq_len++; |
8e09f215 | 325 | spin_unlock_irqrestore(get_ccwdev_lock(base->cdev), |
1da177e4 LT |
326 | flags); |
327 | } | |
328 | ||
329 | rc = 0; | |
13c6204f CH |
330 | if (copy_to_user(argp, dasd_info, |
331 | ((cmd == (unsigned int) BIODASDINFO2) ? | |
8e09f215 SW |
332 | sizeof(struct dasd_information2_t) : |
333 | sizeof(struct dasd_information_t)))) | |
1da177e4 LT |
334 | rc = -EFAULT; |
335 | kfree(dasd_info); | |
336 | return rc; | |
337 | } | |
338 | ||
339 | /* | |
340 | * Set read only | |
341 | */ | |
342 | static int | |
13c6204f | 343 | dasd_ioctl_set_ro(struct block_device *bdev, void __user *argp) |
1da177e4 | 344 | { |
8e09f215 | 345 | struct dasd_block *block = bdev->bd_disk->private_data; |
13c6204f | 346 | int intval; |
1da177e4 LT |
347 | |
348 | if (!capable(CAP_SYS_ADMIN)) | |
349 | return -EACCES; | |
350 | if (bdev != bdev->bd_contains) | |
351 | // ro setting is not allowed for partitions | |
352 | return -EINVAL; | |
d2c993d8 | 353 | if (get_user(intval, (int __user *)argp)) |
1da177e4 | 354 | return -EFAULT; |
f24acd45 | 355 | |
1da177e4 | 356 | set_disk_ro(bdev->bd_disk, intval); |
8e09f215 | 357 | return dasd_set_feature(block->base->cdev, DASD_FEATURE_READONLY, intval); |
1da177e4 LT |
358 | } |
359 | ||
8e09f215 | 360 | static int dasd_ioctl_readall_cmb(struct dasd_block *block, unsigned int cmd, |
8b2eb664 CH |
361 | unsigned long arg) |
362 | { | |
363 | struct cmbdata __user *argp = (void __user *) arg; | |
364 | size_t size = _IOC_SIZE(cmd); | |
365 | struct cmbdata data; | |
366 | int ret; | |
367 | ||
8e09f215 | 368 | ret = cmf_readall(block->base->cdev, &data); |
8b2eb664 CH |
369 | if (!ret && copy_to_user(argp, &data, min(size, sizeof(*argp)))) |
370 | return -EFAULT; | |
371 | return ret; | |
372 | } | |
373 | ||
0000d031 HC |
374 | static int |
375 | dasd_do_ioctl(struct block_device *bdev, fmode_t mode, | |
376 | unsigned int cmd, unsigned long arg) | |
1da177e4 | 377 | { |
8e09f215 | 378 | struct dasd_block *block = bdev->bd_disk->private_data; |
13c6204f | 379 | void __user *argp = (void __user *)arg; |
1da177e4 | 380 | |
8e09f215 | 381 | if (!block) |
13c6204f CH |
382 | return -ENODEV; |
383 | ||
384 | if ((_IOC_DIR(cmd) != _IOC_NONE) && !arg) { | |
385 | PRINT_DEBUG("empty data ptr"); | |
386 | return -EINVAL; | |
387 | } | |
1da177e4 | 388 | |
13c6204f CH |
389 | switch (cmd) { |
390 | case BIODASDDISABLE: | |
391 | return dasd_ioctl_disable(bdev); | |
392 | case BIODASDENABLE: | |
393 | return dasd_ioctl_enable(bdev); | |
394 | case BIODASDQUIESCE: | |
8e09f215 | 395 | return dasd_ioctl_quiesce(block); |
13c6204f | 396 | case BIODASDRESUME: |
8e09f215 | 397 | return dasd_ioctl_resume(block); |
13c6204f CH |
398 | case BIODASDFMT: |
399 | return dasd_ioctl_format(bdev, argp); | |
400 | case BIODASDINFO: | |
8e09f215 | 401 | return dasd_ioctl_information(block, cmd, argp); |
13c6204f | 402 | case BIODASDINFO2: |
8e09f215 | 403 | return dasd_ioctl_information(block, cmd, argp); |
13c6204f | 404 | case BIODASDPRRD: |
8e09f215 | 405 | return dasd_ioctl_read_profile(block, argp); |
13c6204f | 406 | case BIODASDPRRST: |
8e09f215 | 407 | return dasd_ioctl_reset_profile(block); |
13c6204f CH |
408 | case BLKROSET: |
409 | return dasd_ioctl_set_ro(bdev, argp); | |
410 | case DASDAPIVER: | |
411 | return dasd_ioctl_api_version(argp); | |
8b2eb664 | 412 | case BIODASDCMFENABLE: |
8e09f215 | 413 | return enable_cmf(block->base->cdev); |
8b2eb664 | 414 | case BIODASDCMFDISABLE: |
8e09f215 | 415 | return disable_cmf(block->base->cdev); |
8b2eb664 | 416 | case BIODASDREADALLCMB: |
8e09f215 | 417 | return dasd_ioctl_readall_cmb(block, cmd, arg); |
13c6204f | 418 | default: |
1107ccfb | 419 | /* if the discipline has an ioctl method try it. */ |
8e09f215 SW |
420 | if (block->base->discipline->ioctl) { |
421 | int rval = block->base->discipline->ioctl(block, cmd, argp); | |
1107ccfb CH |
422 | if (rval != -ENOIOCTLCMD) |
423 | return rval; | |
424 | } | |
425 | ||
13c6204f CH |
426 | return -EINVAL; |
427 | } | |
1da177e4 | 428 | } |
0000d031 HC |
429 | |
430 | int dasd_ioctl(struct block_device *bdev, fmode_t mode, | |
431 | unsigned int cmd, unsigned long arg) | |
432 | { | |
433 | int rc; | |
434 | ||
435 | lock_kernel(); | |
436 | rc = dasd_do_ioctl(bdev, mode, cmd, arg); | |
437 | unlock_kernel(); | |
438 | return rc; | |
439 | } |